Absolute permissive automatic block-signal system.



WIWLSALIVIUN & FLL. DODGSUN. ABSOLUTE PERIvIIssIvE AUTOMATIC BLOCK SIGNAL SYSTEM.

APPLICATION FILED FEB. 7. 191|.

Patented Mau'. 7, 1916.

3 SHEETS-SHEET I.

FIGLI.

W. W. SALMON L F. L. DUDGSON. ABSOLUTE PERMTssn/E AUTOMATIC BLOCK STGNAL SYSTEM.

APPLICATION .VILEU FEB. 191i.

l 174,939 Patented Maux 7, 1916.

' s sHEETsY--SHEET 2.

7 L y m W. W. SALMON L F. L. DODGSON. ABSOLUTE PERMISSIVE ALHOMATIC BLOCK SlGNAL SYSTEM.

APPLICATION FILED FEB, 19H.

1,174,939. Patented Mar. T, M16.

3 SHEETSW-SHEET 3.

25/ [Wfl/M011 INVENTUM WIT/VESSEL?! @L 7. f W [mfg/M 6 35?;

' vention, reference beingL had to the accom# WILMER W. SALMON ANDFRANKKL. DODGSON, OF ROCHESTER, NEW YORK, ASSIGNORS T0 GENERAL RAILWAY SIGNAL COMPANY,

OF NEW YORK.

ABSOLUTE PERMISSIVE AUTOMATIC BLOCK-SIGNAL SYSTEM.

To all whom t may concern:

` Be it known that we, WILMER W. SALMON and 'FRANK L. DoncsoN, citizens of the United States, and residents of the city of Rochester, in the county of Monroe and State of New York, have invented a new and useful Absolute Permissive Automatic Block- Signal System, of which the following is a full, clear, "concise, and exact description of the physical embodiment vwhich we have selected to illustrate the principle of our inpanying drawings, forming apart of the specification.

This invention'relates to automatic block signal systems and is especially adapted for luse on single track railways.

The object of the invention isto provide a signaling system adapted to be operated by the ordinary closed track circuits commonly used in automatic' block signaling systems and adapted to secure headon protecticn from passing sidingto passing siding, with blocks for following train moves as short as track conditions require.

So far as known to us prior to our invention. a greater part, if not all of the single track railroads in use have employed the ordinary automatic block signal system in which a tra in entering* the block from either direction givesthe same indication and thus has the same protection for following trains as for head-on trains. Many attempts have been made to attain the results attained by our invention, but, so far as known to us, none of the svstems proposed were adapted to be operated by the ordinary closed track circuits in common use on railways and all of them involved using additional and complito be located at and operated by cated apparatus or circuits, and making the operaticn of the signals for following movements more or less dependent upon the operation of signals governing head-on movements. v

Primarily, the invention may be termed a unit system in that our means are adapted any track circuit controlling a signal governing traflic in one direction without regard to signals governing thetrailic in the opposite direction; that in the practical embodiment of our in`- vention the Yusual signals. governing head-on protection are employed. y

Specification of Letters Patent.

but it will be understood, of course,

Patented Mar.

In carrying out our invention, we preferably employ a signal circuit adapted to be opened by a train on the track c1rcuit sections of a block and a further signal circuit adapted to be closed only by a train which enters the block from one direction, both of these circuits being operated by the ordinary closed track circuit sections in common use on railroads. l

fully de- This invention will be more scribed `hereinafter with reference to the forms thereof herein illustrated and which we have selected vas examples for the purpose'of explaining the principles involved, it bemg understood that Vthe invention may be embodied in various forms and arrangements of apparatus.

In the accompanying drawings like reference characters denote corresponding parts throughout the several views, in which:

Figure 1, illustrates diagrainmatically the circuits and apparatus of one form of our invention applied to a railway. Figs. 2 and 3 illustrate diagrammatically modified forms of our invention.

Construction- Referring to Fig. 1', 1, 2

0F GATES, NEWYOBK, A CORPORATION?"` a, i916. i

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and 3 designate track circuit sections, sepav rated by means of insulating joints 4; 11, 21 and 31 designate track batteries for creating` a dilierence of potential between the two rails of the track; 12, 22 and 32 designate relay coils normally energized by current flowing therethrough due to the difference of potential created by the track batteries; 13 designates a' relay armature held normally in the upper position as shown by reason ofy the current flowing in relay coil 12; 23 and 25 likewise designate armatures normally in the upper position shown by reason of current inrelay coil 22; 33 likewise designates the armature of relay coil 32 normally held in the upper position; 5 designates a semaphore as does likewise 6; 51 designate the electric motors for moving semaphores 5 and 6 respectively; 52- and 62 designate the hold clear devices for holding the semaphores 5 and 6 respectively in their moved position; 53 and 5L1 designate metallic arms moved in unison with semaphore 5`and designed to at times make contact with ymetallic strips 55 and 5, the arm 53 making contact with metallic strip 55 at the 45 position of the semaphore and for and 61 position, the arm` 54 contact withthe arm 63 designedk to make contact with metallic strip 66 at the 45 position ofthe Asemaphore and for a few degrees on either sideof said 45 position, 61'making contact with metallic; strip-67 at'the ,zero or danger l'position of the semaphore l"and during the whole movement of the semaphore Iexcept the last few degrees, 65 not making contact at the zero or danger -positionfof the semaphore with metallic strip 63 but making contact therewith as soon as the semaphore has moved a few degrees and remalnlng 1n contact therewith during the 'whole of the remainder of the movement of the semaphore;

-8 designates a relay coil which when current passes' therethrough causes .armature 81 to be held in its upper position; 7 designates relay coil which when a current of sufficient value passes therethrough vvill'draw arma-v ture 71 fto the upper limit of its movement;

- I9 designates a resistance which is of such value that it. will,l allow suiiicient current to pass therethrough to suiiicientlyI energize coil 7 so that it will hold armature 71 in its upper position if already there but will not allow sufficient current to pass therethrough to sufciently energize Icoil 7 .so that it will move armature` 71 to its upper position, if it is in its lower position.

Inthe arrangement shown in Fig. 2, only one semaphore I11 is employed having three positions; 111 designates the motor for moving the semaphore to its different positions; 112 designates the hold clear device for holding it in 'each of its moved positions; 113, 111, 115 and 116 designate metallic arms adapted `to contact' at times with metallic strips 111, 113, 113, 111, 1111, 1112; 1113 contacts with 117 from zero or danger position almost to the or caution position; 111 'contacts with 113 from zero or danger position almost to the 45 or caution position and with 118 from just below the 45 position almost to the full clear or 90 position; 115 contacts w-ith 1110 at and for a few degrees on each side of the full clear or 90 position'and with 1111 at and for a few degrees each side of the 45 position; 113 contacts with 1112 from the 90 position valmost but not quite to the 45 position.

The only additional elements of construction shown. in Fig. 3, not operably connected in Fig. 1, are the relay armature 21 actuated by the relay coil 22 and the additional circuit .breaker parts operated by semaphore arm 5.

Operation-1n the normal condition of the connections as shown in Fig. 1, relay 8 is energized by current in the following circuit; positive terminal offriraA 19, relay 'armature 33, wire 20, relay arma-'` ture 23, wire 21, relay coil 8, wires 22, 23, `24 and 25 to the 'negative terminalof bat-vy` 70 tery 17; the relay coil beingf-thus energized the armature 81 is normally held in' its'upper position.

Ifl a train moving in the direction of the I will shunt the relay 12 thereby dropping the armature I3 so that it-makes connection with its back contact, thereby establishing the lfollowing circuit :I positive terminal of battery 10, wires 26 `and 27, armature 81, wires l 28 and 29,- metallic strip 67, arm 64,1 wire 30, Imotor 61', wires v31, 32 and 33, relay '611 will break contact withv strip 67 thus stopping the motor,-but atthe 45 position of the .semaphore thefarm 63'Wi1l makecon- Atact with metallic strip 63 so that the'current.

rarrow a in Fig. 1, comes upon section 1,it

armature 13, wires 34 and 24l tothe negative 'terminal of battery 10. The current iowing f which formerly owed through the motor will now flow through the hold clear device:

from the Wire 28 by the following path:

wire 28, wire 35, strip 6, arm 63, wire 36,

holding coil 62, wire 37 to wire 33 and so i by the before traced path to the negative terminal of the battery. The current flow- 'ing in such last traced path will 'cause the semaphore'to b e heldin its 45 or clear -po- 5 sition, as soon however as the train which entered section, 1, enters section 2, the relaycoil 22 will b e shunted, the armature 23 will l break contact with wire 20 and therefore -the current through relay coil 8 will cease causing armature 81 to fall stopping the flow 'of current through the'4 holding coil, which consequently permits the semaphore 6 to fall to the zero or danger position to protect the train. The semaphore 6 will remainat danger and cannot be 4moved to the 45 yposition so long as a train is en section 2 or 3 for under such conditions the energ1z1ng circuit for relay coll 8;1s broken either by the dropping `of armature 23l orl armature 33 depending-on whether a train is on section 2 orr3. As soon, however, as

the train which passed signal 6 passes the end of track section 3 the relay 8 will again become energized, relay armature 81 will be lifted and the system would thenl be in condition to be again operated as before.

When a train enters section 2 traveling in the direction of'the arrow athe semaphore 6 is, at that instant, in the 45 or clear position so that arm 65 makes contact with strip 63 and as by the entrance of the train on section 2 the armatures 81 and 23 are allowed to fall for' reasons heretofore eX- plained, a circuit is formed as follows: positive terminal of battery 10, wires 26, 44 and 38, arm 65, strip 68, wire 39, armature 25, wires 40 and 41, relay coil 7 wires 42, 23 and 24 tp the negative terminal ofbattery 10. The current flowing in the above mentioned, circuit suliiciently energizes coi] 7. so that it lifts armature 71, thereby rendering effective another circuit as follows: positive terminal of battery 10, wires 26 and 27, armature 81, wire 43, resistance 9, wire 41, relay coil 7, wires 42, 23 and 24 to the nega-tive terminal of the battery. The current flowing in this last traced circuit it will be observed does not depend upon the position of semaphore 6 for its continuity, but due to the resistance 9 the current flowing is only suiiicient to hold the armature 71 in its upper position, but is not sufficient to raise the armature if it is down, it being necessary to have a circuit made through arm 65 and strip 6s to cause suficient current to flow through relay coil 7 to raise armature 71, so that after 71 has once been raised by the entrance of a train upon section 2 traveling in the direction of the arrow a, it will remain in its upper the said train is on either sections 2 or 3, but Will fall to its lower position as soon as the train leaves 'section 3, as the relay coil 8 will then lift armature 81 and break the circuit through coil 7.

' If a second'train should approach traveling in the direction of the arrow a before the first train had left sections 2 or 3 so that armature 71 was still in its upper position, upon entering section 1, 1t would shunt relay coil 12 and cause armature 13 to dro-p thus closing the following circuit:l

positive terminal of Ybattery 10, wires 26, 44 and 45, armature 71, wire 46, strip 5", arm 54, wire 47, motor 51,-wires 48, 49, 50, 32 and 33, armature 13., wires 34 and .24 to the negative terminal of battery 10. The current in said circuit would operate the motor 51 to move the semaphore 5 to the 45 position at which point arm 5'1 would break contact with strip 5 thus cutting olf the current from the motor, but at the samel time the current which was flowing through the mon tor would be directed through the hold clear device 52 flowing from wire 46 to wire 51, strip 5, arm 53, Wire 52, holding coil 52, Wire 53 to wire 50 and to the negative terminal of the battery as before, thus holding the semaphore in its 45 position. It is to be observed that the said second train would not be able to clear semaphore 6 if a train were in either section 2 or 3 for the very presence of a train on either of said sections denergizes relay 8, thus causing armature 81 to be in its lower. position, thus breaking the operating circuit for semaphore 6.

When the second train passes semaphore 5 it goes to the zero or`danger position due position during the time to the fact that armature 13 is drawn to its upper position, but all other parts ofthe system remain as before so that a third train approaching in the direction of arrow a would be able to operate semaphore 5 to its 45 position and so enter section 2.- It will be thus seen that sections 2 and 3 could be filled with trains all going in one direction without danger of collision, and a train approaching section 2 in the direction'of arrow a could not operate semaphore 6 until the last train had left section 3, for just so long as there isv atrain on section 2 or -3 relay armature 81 would be down, thus preventing the operation of semaphore 6. It is also to be observed that as soon as the last train left section 3, the neXt'train approaching in the direction of arrow a would not be able to operate the semaphore 5 for by the exit of the preceding train from section 3 relay coil 8 would be energized and armature 81 lifted breaking circuit through coil 7 which would cause armature 71L to drop preventing the operating' circuit of semaphore 5 from being closed by the entrance of a train on section 1.`

If a train should enter section 3 traveling in the direction of arrow b it would prevent all operation of the signals 5 and 6 by the subsequent entrance of a train on section 1 moving in the direction of arrow a, for the first said train would shunt relay 32 thus causing armature 33 to drop and break the energizing circuit of relay 8, which would cause armature 81 to fall and prevent the clearing of semaphore 6 when the said subsequent train entered section 1. The dropping of relay armature 81 would not however` cause relay 7 to be energized by the circuit heretofore described for resistance 9 would not allow sufficient current to How through relay coil 7 -to energize it sufciently to lift armature 71 consequently the operating circuit of semaphore 5 would be broken; whiehcondition wouldl exist as long as th; first said train remained on sections 2 or y Those skilled in the art of railway sig-l naling and especially single track automatlc block signaling can' readily understand that v above described accomplishes a thesystem result not before attained but longsought, for by its use all of the advantages of a signal system employing track circuits are preserved, the advantages of an automatic system are preserved and at the same time the added result of being able to govern semaphores 5 and 6 in accordance withthe pres l would .be formed as follows: positive terminal of battery 10, wires 26 and 27, armature 81, wires 28, 54 and 55, strip 117, arm 113,

wires56 and 57, motor 111, wires 58 and 33, armature l?, wires 34 and 24 to the negative terminal of battery 10. The current in the above traced circuit operates the motor and moves'the semaphore to 'the 45 position, at

which time arm 118 breaks contact with strip 117 so that current through the above traced path is cut oi from the motor, but at the same time arm 111 makescontact with strip llssothat a circuit is made from wire 54, through strip 11s and arm 111 to wire 57 and .the wire 58, the current in which circuit causes the motor to further operate to move the semaphore to the full clear or 90 position, at which time 111 breaks contact with strip 11.a cutting off current from the motor, but at the same time arm 115 makes contact with strip 1110 so that a circuit is made from wire 28 through wire 59, strip 111, arm 115, wire 60, holding coil 112 and wire 61 to wire 33, and the current iowing in said circuit holds the signal inthe full clear or 90 position, in which position it remains until the train enters on section 2 at which time the semaphore rreturns to the danger or zero degree position because the holding circuit is broken by the shunting of relay 22, the deenergization of relay 8 and the consequent dropping of relay armature 81.

When semaphore 11 was in the full clear position the pick-up circuit for armature v71 was made through arm 11 and strip 1112 just as it was made as shown in Fig. 1 and after such circuit was made the holding circuit through-relay 7 acted to hold the armature 71l in its upper positirn. If a train traveling in the direction of arrow a enters section 1 before a preceding train has cleared sections 2 or 3 the shunting of relay coil 12 and the consequent dropping of armature 13 would complete the followingcircuit: positive terminal of battery 10, wlres 26, 44 and 45, armature 71, wires 62 and 63, strip 11, arm 111, wire 57, motor 111, wires 58 and 33, armature 13, wires 34 and 24 to the negative terminal of battery 10, and the current fiowing in said circuit wo-uld operate motor 111 to move the semaphore to the 45 position at which point arm 114 would break contact with strip 119 and current would flow from wire 62 to wire 64, strip 1111, arm 11, wire 60 through the holding coil 112 to wire 6l and thence to wire 33, energizing the holding coil and holding the semaphore in the 45 position. `When the arrow a would move semaphore 11 to the full clear position. A train entering section 3 traveling in the direction of arrow b would not pick up armature 71 for the pick u circuit would be bro-ken at arm 11e there ore a subsequent train entering sectionfl traveling in the direction of arrow a couldlnot move semaphore l1 to either of its operated positions.

It is to be observed that whereas the aspects under di'erent conditions of semaphore 11 are diierent from those of semaphores 5 and 6, that the indications given by one semaphore 11 are exactly the same as given byv two semaphores 5 and 6.

In Fig. 3 is shown a modification of Fig. 1, wherein semaphore 5 is caused to have different aspects according to whether a train which has passed semaphore 5 going in the direction of arrow a is in Section 2 or section 3. This is accomplished by giving to semaphore 5 one more position than it had in the form illustrated by Fig. 1, so

that when a train is onsection 2, semaphore 5 could be moved to the 45 posit1on,vbut

when the train is on section 3 it could bev moved to the position. l

A train approaching semaphores 5 and 6 from the direction of the arrow7 i will enter upon section l, and as 1n the form' shown b v Fig. 1, if no train is on section 2 or 3 semaphore 6 will be moved-to the 45 tered upon section 2 or 3'from the 'direction of the arrow b, the train approaching fromv the direction of the arrow a would receive no proceed signal at all. train approached in the ldirection of `arrow a while a preceding train was on section .2, the semaphore arm 6, as was the case 1n Fig. 1, would not be moved but the semaphore arm 5 as was the case in the form shown inFig. 1, would move to the 45 position. In the form shown. by Fig. 3, however, in order to differentiate the condition of the presence of a train in section 2 from that when a trainl is in section 3, the semaphore 5 would move to the 90 position if a train approached in the direction of the arrow a while a preceding train was on section 3. the circuit for such a movement when relay armature 71 is in,

If, however, a l

position allowing the train to proceed at' its upper position due to the passing of a train in the direction of arrow aebeyond the semaphores-5 and 6 being` as follows :positive side of battery 10, wires 26, 44, 45,. armature .71, wires 46, .71, armature 24, wires 7 4 and 75, metallic strip 5s, arm 5, wire 47,

motor 51, wires 48, 49, 50, 32, 33, armature 13, wires 34 and 24 to the negative terminal of the battery 10.V lThe current flowing in the above traced path would cause-the motor to operate and move the-semaphore 5 to its 90 position, it, of course, being moved previously by the same circuit as described in Fig. l, to the 45"` position and after it has been moved by current` in this last traced path to the 90 posit-ion, the current would then pass by wire 76 to metallic strip 5", arm 53 and wire 52 to the hold clear coil 52, and thence to the negative terminal of the battery by wirev 53 as in the case when v the motor was being operated.

It will thus be understood that in the form of the invention illustrated by Fig. 3, a train approaching semaphores 5 and 6 in the direction of the arrow a will be given a distinctive aspect due to the presence of a train on either sections 2 or 3. Although applicants have selected the welll known normal danger system of operating signals in connection with the embodiment of their invention which` they have selected to illustrate the principle of their invention, it is. to be distinctly understood that it is immaterial whether the so-called normal danger system of signaling is emloyed in connection with this invention or` whether the so-called normal clear system is employed for, to transpose from the normal danger system to the normal clear system would simply mean the absence of the preliminary clearing section 1, shown in, each of the figures and in place thereof, the substitution of the conductor shown by dotted line 77 in each of the figures. 1t is furthermore `tobe observed that the aspects of the signals would either with the normal danger or the normal clear systems be identical and that under the same conditions as regards the presence of a trainwhich has passed the semaphores 5 and 6, the aspects of the signal displayed to an approaching train would in the two svstems be identical.

In practice all of lthe systems shown would be duplicated for single track, the opposingsemaphore-corresponding to semaphores 5 and 6"'-and 11 being in the well known manner interlocked electrically, that is, 5 and 6 and 11 at with 5 and 6 and- 11 at the other end and all would be controlled by the same track circuit sections, so that a train approaching a semaphore in either direction would, if semaphore 6 or 11 moved to the clear position, enter the block controlled thereby atl phore assumed the one endof the blockl to the 45 position the train would enter the block under control. If neither sema- 4:5f3 position the approaching tram would not enter the block. -Althcugh We have herein shown and described the relay 7 as governing a sema' phore 5 or a position of a semaphore 11 it is to be understood that such are only ysingle instances of an exhibition of its functions. In its broadest aspect the principle of relay 7 may be employed in controlling one or more aspects of any-semaphore, located at any point, having a pluralityy of aspects, when such semaphore should have some one or more of its aspects controlled by the presence and direction of movement of a train on the track circuit sections controlling relay 7, and it is immaterial whether or not such'semaphore is also jointly controlled in its aspects by other means, and therefore we desire it to be understood that such applications being well within the' modified to meet individual cases. The sig- Y nals may be of any suitable type and the indications caused to occur in any well vknown manner and in locations -according to conditions.

Having particularly described the construction and operation of physical embodiments of our invention and explained 4 Athe operation and principle thereof, what we claim as new and desire to protect by Letters Patent is:

1. ln a railway signal system: a. signal having a. biased aspect and a plurality of operated aspects; aclosed track circuit; a relay controlled by said closed track Circuit; a normally closed circuit containing a second relay controlled by the first relay; a circuit including said signal controlled by said second relay; a normally open circuit controlled by said first relay including a third relay and a circuit controller adapted to be closed in an operated. aspect of the signal, said third relay adapted to be energized by the shunting of the track circuit when said ycircuit controller is closed; an armature raised by the energization of said third relay;v a further normally open circuit including said third relav controlled by said second relay and Aincluding a limiting resistance adapted to be cllosedgwhen the track circuit is shunted and adapted to maintain the armature of said third relay in the raised position after it has been moved thereto bv the closing of the first mentioned normally open circuit after said circuit controller is opened; a normally open circuit including said signal con- 4trolledbythe armature of said third relay; and means to" furnish electrical energy to each. of said circuits. f

2. In a railway signal system': a block; a signal governing the entrance to one end of saidblcck and adapted to have anormal bias aspect and a plurality of. operated aspects;` a closed circuited track circuit of which the rails of said block form a part;

a source of energy in saidcircuit and atranslating mechanism in said .c circuit; means controlled by the translating mechanism adapted for causing an operated aspect of said signal; a second translating mechanism, including a normally lowered armature: means controlled by the first vmentioned translating mechanism and the aspect of the signal adapted for energizing the second mentioned-translating mechanism sufficiently 'for raising its normally' lowered armature; means controlled by the first mentioned translating device operative to' retain the said armature in its raised position'after being raised thereto while said first mentioned translating mechanism is deenergized; means governed by the armature lof said second translating mechanism adapted to cause another operated aspect of said signal.

3. In a railway signal system: a signal having a biased aspect and an Ioperated as- A peet; a closed track circuit; a translating device controlled by the closed track circuit; a normally closed circuitl containingA a second ltranslating device controlled, by the first mentioned translating device; a circuit for controlling the operated aspect ofthe signal 'controlled by the second men-'\ tioned translating device; a normal-ly open circuit controlled bytthe first mentioned translating device including a third translating device and a circuitcontrolleradapted to be closed in the operated aspect of the signal; the third mentioned translating device including a normally lowered armature; the third mentioned translating deyice adapted to be sufficiently energized by the shunting ofthe track circuit when the circuit controller 's closed for raising the normallylowered rmature; a' second normally open circuit controlled bythe second. mentioned translating device and including the third mentioned translating device and a' limiting resistance adapted to be closed when the track circuit is shunted and adapted to maintain the armature of said third mentioned translating device in the raised positionafter being moved thereto by the closing ofthe first mentioned normally open circuit after said first mentionedcircuit conl troller is opened; 'a normally open circuit forsignaling controlled by the armature of said third Imentioned translating device;

and means t6 furnish electrical energy to each of said circuits.

4. In a railway signal system: a signal having'a biased aspect and anoperatedaspeet; a 'closed track circuit; another closed track circuit; a translating device controlled by the first mentioned track circuit; a translating device controlled by the second mentioned track circuit; a normally open circuit controlled by both of the translating devices, said normally-open circuit adapted to govern the signal; a second normally open circuit controlledby Athe second mentioned translating device including a' third translating device and a circuit controller controlled by the aspect of the signal; said third mentioned translating device includingl a..

normally lowered armature; -said'third mentioned translating device adapted to be sufnciently energized by the shunting of the' second mentioned translating deitice when thecircuiticontroller is closed toraise the normally lowered armature; a third normally open circuit including the third mentioned translating device and a limiting resistance adapted to be closed when the second mentioned translating device is shunted and adapted to maintainthe third 'menf tioned translating device sufficiently energized to retain its armature in its ralsed position after being raised thereto after the said circuit controller is opened; a fourth normally open circuit for signaling controlled by the armature of the third mentioned translating device and the first mentioned translating device; and means to furnish'electrical energy to each of said circuits.

5. In 'a railway signal system: a closed track circuit; a second closed track`circuit; a signal circuit; means controlled .by the said track circuits for governing said signal circuit; a normally open energizing circuit lincluding a relay; means forclosmg said normally open energizing 'circuit controlled -by the signal circuit and by a track circuit; a normally open holding circuit including the said relay; said normally open holding circuit controlled by said first named means; and means controlled by said relay for signaling, l

6. In a' railway signal systemi `a signal;

' section, a translating device having two terl 7 Ina railway signaling system, a trackway composed of two lines of ,electrically conductive rails, a section of the track rails separated by insulating joints from the rest of the trackway, a source of electricity having two terminals, each of said terminals connected to one of the track rails of the minals, each of said terminalsfconnected to 'one of the track rails of the section at a distance from the connections of Ithe source of electricity, a second section of the track'rails separated by insulating joints from the liest of the trackway, a source of electricity having :two terminals, each of said `terminals connected to one of the track rails of the secondl section, another translating device having two terminals, each of said `terminals connected to one of the track rails of the second section at a distance from the connections of the source of electricity, a normally closed circuit, means controlled by the said normally closed circuit for signaling, means controlled by .said translating devicesV for governing said normally closed circuit, a normally open circuit, means for closing said normally open circuit controlled by said normally closed circuit, means to maintain'closed said normally open circuit controlled by the normally closed circuit, and means controlled by the said normally open circuit for signaling. l v

8. In a railway signaling system, a closed track circuit, a second closed track circuit,

each-of said circuits including a translating device', a normally closed circuit governed by the translating devices, means controlled by the said normally closed circuit for sigs naling, a normally open circuit, means for ,closing said normally open circuit controlled by said normally closed circuit, and the translating device of the first mentioned track circuit, means to maintain closed said normally open circuit controlled by the normally closed circuit, and means controlled 'by the said normally open circuit for `signaling.

9. In a railway ,signal system, a signal including moving and holding means, and adapted for a lurality of aspects, a block including closedP circuitedv track circuit sections, the entrance to which in one direction is governed by said signal, means governed by' said track circuit sections including anormally energized controlling device adapted for causing one of .said aspects, a

circuit controller governed bysaid one aspect of the signal, means controlled by said circuit controller adapted 'to be energized by the entrance cfa train in one direction only upon said block, a circuit vcontroller controlled thereby adaptedv to determine another aspect of said signal.

10.. In a railway signaling system, a closed track circuit, a second closed track circuit,

`maintain 'closed said normally open circuit,I

and means controlled by the said normally open circuit for signaling.

11 In a railway signaling system, a trackway composed of two lines of electrically conductive rails, a section of the track rails separated by insulating joints from the rest of the trackway, a source of electricity having two terminals, each of said terminals connected to one of the track rails of the section, a translating device having two terminals, each of said terminals connected to one of the track rails of the section at a distance from the connections of the source of electricity, a second section of the track rails separated by insulating joints from the rest of the trackway, a source of electricity having two terminals, each of'said terminals connected to one of the track rails of the second section, another translating device having two terminals, each of said terminals connected to one of the track rails of the second section at a distance from the connections of the source of electricity, a

normally open circuit, means to .complete said normally open circuit controlled by both the translating devices, means controlled by said normally open circuit for signaling, a second normally open circuit','

mentioned normally open circuit to maintain said third mentioned normal-ly open circuit partially closed, and means controlled by the third mentioned normally open circuit for signaling.

12. In a railway signaling system, a closed track circuit, a second closed track circuit, a normally open circuit, means to complete said normally open circuit controlled by both the track circuits, means controlled by said normally open circuit for signaling, a second normally open circuit, means for completing said second mentioned normally open circuit controlled by' said second mentioned track circuit and said first mentioned normally open circuit, a third normally'open circuit controlled by said first mentioned track circuit and the .second mentioned normally open circuit, means rendered operative by said second mentioned normally open circuit -to maintain said third mentioned phore controlling mechanism, a closed track? circuit, arelay controlled by the said closed track circuit, a normally closed circuit con- .v

tainingla second relaycontrolled by the first relay, a circuit including said semaphore contro-lling mechanism controlled by sai'd second relay, a normally open'circuit controlled by saidxfirst relay including a third relay. and a circuit .breaker adaptedV to be closed by the semaphore controlling mechanism, said third relay adapted to be energized by the shunting of the track circuit when said circuit breaker is closed, a second normally -open circuit including said third relay-adapted to be closed when the track circuit is shunted andadapted tovmaintain said .third relay energized after said circuit breaker isppened while'said track circuit is shunted, and a third normally open circuit controlled by said third relay, a semaphore controlling mechanism controlled -by the said last named normally open circuit, and means to furnish electrical energy to each of` said circuits. v l

14. In a railway signaling system, ablock, a signal governing the"entrance to one end of said block and. adapted -tohave a biased aspect anda plurality of operated aspects, a closed circuited track circuit of whichthe .rails of said block form a part, a-source of energy in said circuit and' translating mechanism in said circuit, means controlled by the translating mechanism adapted for governing an operated aspect of said signal, another translating mechanism,v means controlled by the first named translating mechanism and the aspect of the signal adapted .fonenergizing said other translating mechanism, and means governed by said lastnamedv translating mechanism adapted to govern another operated aspect of said signal, means. rendered operative by the en ergization of said last-named translating mechanism to control said last-named means. l 15. In a railway signaling system, a semaphore controlling mechanism, a block, a

closed circuited track circuit of which the rails of said block form appart, a source of energy in said circuit and a Atranslating mechanism in said circuit, means controlled by the translating mechanism adapted for governingv the semaphore .controlling mechanism, another translating l mechanism, means controlled by the first named translating mechanism and the semaphore controlling mechanism adapted for energizing .said other translating mechanism, a semaphore controlling mechanism, means governed by said last-mentioned translating device to govern said last named semaphore' controllingv mechanism, and means renderedoperative by the energization of said lasts ing a source of' electricity, means controlled by the translating :devices to .break the normallyclosed circuit, means governed `by the mally open circuit, a circuit controller controlled by the normally closed circuit, means controlled by the first mentioned translating device and said circuitcontrollr to complete sa-id normally open clrcuit, means governed by the translating devices, to maintain'v said lnormally open circuit closed, and means signaling.

governed bythe normally open circuit for .normally closed circuit for signaling, a norv vice, another normally energized translating device, a normally closed circuit, means controlled by the translating devices to break the normally closed circuit, means controlled bythe normally closed circuit for signaling,

a' normally open circuit, means controlledv jointly by the normally closedl circuit and the first mentioned translating device to close said normally open circuit, means governedsimilarly and solely by either of said' translating devices to maintain vsaid normally open circuit closed, and means controlled by the 'normally openv circuit forfsignaling.

18. A normally energized ltranslating device, another normally energized translating device, a normally closed circuit, means controlled by the translating devices to break the fnormally closed circuit, means controlled by the normally closed circuit for signaling,

a normally open circuit, means controlledl jointly by the normally closed circuit and the irst mentioned translating device to close. said normally open circuit, means governed by veach of said translating devices separately and independently to retain said normally open circuit closed, and means controlled by the normally open circuit'for signaling.

19. In a railway signaling system, a closed l track circuit, a second closedtrack circuit, a

normally closed circuit, meansfor breaking said normally closed circuit controlled by both of said track circuits, means for signaling vcontrolled by said normally closed circuit, a normally open circuit, means for completing said normally open circuit controlled by said iirst mentioned track circuit and said normally closed circuit, a second normally open circuit including. a limitingresistance and a source of electricity for maintaining said first mentioned normallyl open circuit closed, means to close said second normally open .circuit controlled by both of said track circuits, the limiting rev ond normally open circuit to close said first mentioned normally open circuit, but will allow sufficient current to iow through the second mentioned normally open circuit to maintain the first mentioned normally open circuit closed after being closed, and means for signaling controlled by said first mentioned normally open circuit.

20. In a railway signaling system a semaphore having an operated position and a biased position, means for causing said'semaphore to move from a biased position and be held in an operated position, a normally open circuit including a source of energy for controlling said means, a normally closed circuit, means including track` circuits for governing' said normally closed circuit, means for signaling controlled by said normally closed circuit, and means for closing said normally open circuit controlled by said normally closed circuit and one of the track circuits.

21. In a railway signaling system, a semaphore having an operated position and a biased position, a motor for causing said semaphore to move from the biased position to the operated position, a normally open circuit including said motor and a source of energy, a normally closed circuit, means including track circuits Jfor governing said normally closedcircuit, means for signaling controlled by said normally closed circuit, means for closing said normally open circuit controlled by said normally closed circuit, and means to maintain closed said normally open circuit controlledv by said track circuits.

22. In a railway signaling system: a plurality of translating devices; a circuit including means for controlling its own continuity, the said means for controlling the continuity of the circuit beingcontrolled by the translating devices; a normally open circuit including another translating device and including means for completing its own continuity, said last mentioned means being controlled by the first mentioned circuit and by one of the translating devices; means controlling the other translating device yto maintain the last mentioned translating device energized after being energized, said means being controlled by a translating device; means controlled by the first mentioned circuits and by the normally open circuit for signaling, and a source of current for each of said circuits.

23. In a railway signaling system in combination: a semaphore; a second semaphore; a normally closed circuit for governing the first semaphore; a normally open 'circuit for governing the second semaphore; a trackway over which both said semaphores govern movements in the same direction; means dividing said trackway into a series of track circuit sections; means including a track .circuit section for governing said first mentioned circuit; and/means governed by the operation of the track circuit sections in one sequence only including a`` circuit controller v governed by the normally closed circuit fer closing the first normally open circuit.

24. In a railway signaling system, in combination: a circuit controller having an open and a closed position and remaining temporarily in its then position after a change in its governing circuit; a governing circuit for said circuit controller; a circuit including said circuit controller; means having coperating contacts in series with said circuit controller for closing said last mentioned circuit only before said circuit controller moves from its temporary position after a change in its governing circuit; and means for signaling controlled jointly by said last mentioned circuit and said governing circuit.

25. In a railway signaling system, in combination: a circuit controller; a governing circuit for said circuit controller; said circuit controller having an open and a closed position and being in'closed position only when said governing circuit is closed and remaining in closed position temporarily after said governing circuit is opened; another circuit including said circuit controller; means having coperating contacts 1n series with said circuit controller for closopen circuit; means for controlling said normally open circuit governed jointly by said another circuit and said governing circuit only before said circuit controller moves from its temporary closed positionafter the opening of its governing circuit, and means for signaling controlled by said normally open circuit.

26. In arailway signaling system, in combination: a signal -having an operated position and a biased position; a governing circuit for said signal; a circuit controller controlled by said signal and having an open and a closed position, said circuit controller temporarily remaining in its then position after a change in said governing circuit; another circuit including said circuit controller; circuit controlling means included in said another circuit in series with said circuit controller for closing said another circuit; a signaling circuit; means for controlling the signal circuit controlled jointly by said another circuit and the governing circuit for said signal only before said circuit controller moves from its temporary position after a change in the governing circuit of said signal, and means for signaling controlled by said signaling circuit.

27, In a railway signaling system, in comico bination: a signal having an operated position and a biased position; a'governing circuit for ysaid signal; a circuit controller controlled `by said signal and being in closed position when said signal is in 0perated position, said circuit controller temporarily remaining in closed position after the opening of said governing circuit; an-

other circuit including said circuit con-l of the trackway and remaining momentarilyin closed position after the shunting of said track circuit; a circuit having therein only two points of possible break; one point being controlled by said circuit controller; means-for closing said circuit at the other point; and means for signaling controlled jointly by said circuit and a crank circuit of said trackway after the same has been shunted and during the time the circuit controller is momentarily in closed position.

29. In a railway signaling system, in combination: a track circuited trackway; a circuit controller controlled by a track circuit of the trackway and remaining momentarily in closed position after the shunt` ing of said track circuit; a circuit including said circuit controller circuit controlling means included in said circuit in series with said first circuit controller; and means for signaling controlled jointly by said circuit and said track circuit `after the same has been shunted and during the time the circuit controller is momentarily inv closed position. 4,

30. In a railway signaling system, in combination: a track circuited 'trackway; a cirj cuit controller having an open and a closed position and controlled by a plurality of track circuits of the trackway and momentarily in closed position after the shunting of one of said track circuits; a circuit including said circuit controller; means having coperating contacts in series with said circuit controller for closing said circuit;l

means controlled jointly by said circuit and the said one track circuit after it is shunted .and during the time the circuit controller is momentarily in closed position, and means for signaling controlled by said means.

31. In a railway signaling system, in combination: a track circuited trackway; a normally open circuit; a circuit controller having an open and a closed position co'ntrolled by a plurality of track circuits of said normally open circuit, and Ineaiis'con-a` trolled .by said normally open 'circuit for signaling.

32. In a railway signaling system, in combination: a normally closed signaling circuit;l a circuit controller governed by said signaling circuit; a track circuited trackway; means controlled by. said track circuited trackway for governing said normally closed signaling circuit;- a relay included in two normally open circuits, one of said circuits being a preliminary energizing circuit and the other being a maintaining circuit; means including said circuit controller for closing said preliminary energizing circuit and for keeping the preliminary energizing circuit'closed after the irst mentioned normally closed circuit i's opened until the said maintaining circuit is closed; means controlled by said track circuited trackway for closing said maintaining circuit while the normally closed signaling circuit is open; and means for signaling controlled by said relay.

33. In a railway signaling system, in combination: a signal having a stop indication position and a proceed indication position; a track circuited trackway; a normally closed signaling circuit controlled by a p0rtion-of said track circuited trackway for governing said signal indication positions;

-a relay included in twonormally open circuits, one of said circuits being an energizlios ing circuit and the other being a maintain- A ing circuit; a circuit controller governed by said signal and closed when said portion of the track circuited trackway is not shunted and the signal is in proceed indication position and remaining closed after said portion of the track circuited trackway is shunted for a suficient length ot time for said maintaining circuit to be closed; means for closing said energizing circuit including said circuit controller; means controlled by said portion of the track circuited trackway for closing said maintaining circuit; and means for signaling controlled by said relay.

34. In a railway signaling system; in combination: a signal having an operated position and a biased position; a track circuited ltrackway; translating devices controlled thereby; means controlled by the translating devices for governing said signal; a relay included in a normally open circuit; means for completing said normally open circuit and preliminarily energizing said relay;I a

troller governed by said signal and closed only when the signal is in proceed indication circuit controller included in saidcircuit andvgoverned by said signal and in closed position only whenl said signal is in oper- 35. In a railway signaling system,in combination: a signal having a stop indication= position and a proceed indication position; a track circuited track; means ,controlled by a portion of said track circuited trackway protected by said signal for governing said signal indication positions; a circuit conposition; a relay; means dependent onthe circuit controller being in its closed position and upon a track-circuit of said trackway being shunted for preliminar-ily energizing said relay; means for keeping said relay energized after it has been preliminarily energized while said portion of the track circuited trackway is shunted; and means for signaling controlled by said relay.

36. In a railway signaling system, in combination: a track circuited .trackway including track relays; a relay included in a normally openenergizing circuit and a normally open holding circuit; a circuit controller controlled by a track circuit of the trackway and open when the track relay connected to said track circuit is shunted;

said circuit controller 'remaining momentarily in closed position after the deiiergization of the track relay connected to said track circuit; means Jfor closing said normally open energizing circuit; means controlled by the said track circuit when shunted for closing said normally open holding circuit; and means controlled by said relay for signaling.

37. A signal, two track sections, a circuit controlled by each track section and itself controlling a normal indication of said signal. a local circuit controlled by one of said track sections and operative only while the signal is unchanged to a determined degree from its normal indication, a permissive signal controlled by said local circuit, andv means for continuing the indication of said permissive signal when once caused until both track sections are unoccupied.

38. Two track circuits, a circuit controller governed thereby, a signal, a controlling circuit for said signal; means for governing said last named circuit; said means being controlled jointly by one 'of said track circuits and said circuit controller before the circuit controller is moved to a determined degree from its then position by the operation of the track circuit.

39.' A track circuit, a circuit controller governed thereby, a signal controlling circuit,ineans for governing said last named circuit; a circuit for governing said means which is controlled jointly by the track circuit and the circuit controller before the circuit controller is moved to a determined degree from its then position by the operation of the track circuit, a second track circuit, and means governed thereby for governing the circuit controller.

40. A track circuited trackway, a circuit controller governed by a track circuit` of T said trackwa a si nal a circuit overnin said signal, means for temporarily maintaining said last named circuit between the operationof said track circuit' and the movementl ofsaid controller to a determined position, a holding circuit adapted to maintain said signal, and means for establishing said holding circuit upon the operation of said track circuit and during the temporary maintenance of said signal governing circuit and for maintaining the same during a predetermined condition of the trackway.

fil. A track circuited trackway, a circuit controller governed by two or more track circuits of said trackway, a signal, a circuit governing said signal, means` for temporarily maintaining said last named circuit between the operation of one of said track circuits and the movement of said controller to a determined position, .a holding circuit and means for establishing said holding circuit upon the operation of said track circuitv and during the temporary maintenance of said signal governing circuit and for maintaining the same during a predetermined condition of the trackway.

42. A track circuited track'vvay, a signal governing tratiic in one direction and controlled by one or more track circuits of said trackway, another signal controlling tratlic in the same-direction, a normally open circuit adapted to control said another signal governing traffic 1n the saine direction,

means for temporarily maintaining said circuit during a predetermined' position of said first signal When one of theV track circuits governing said signal is occupied, and means for continuing said circuit during the occupancy by a train of one or more determined track sections.

43. A track circuited trackway, a signal controlled by a track circuit of said trackway, a circuit controlling a signal indication, means for rendering the same operative only during the time between the operation of said first ,named track circuit ani the movement of the signal to a determined position, andmeans controlled by another track circuit for rendering said circuit inoperative at all times.

44. A trackcircuited trackvvay, a signal controlled by a track circuit of said trackway, a circuit controlled by a track circuit of said trackway and controlling a signal indication, means for rendering theV same operative only during the time between the operation of the track circuit controlling said circuit and the movement of the signal to a determined position, means controlled by another track circuit for rendering said clrcuit inoperative at all times, andv means for continuing the operation of the signaling circuit when once established during the occupancy of a predetermined section of said track circuited trackway.

46. In a railway signaling system, in combination: a normally closed circuit controller; a governing circuit for said circuit controller, said circuit controller remaining closed temporarily after a change 1n its governing circuit; a normally open circuit including said circuit controller; and means for signaling initially controlled jointly by said last mentioned circuit and said governing circuit and controlled solely by said governingcircuit after responding to said joint control.

47. In a signaling system for railways, in combination: a stretch of trackway divided into track circuit sections; a signal governing trafiic in one direction over said stretch and having a biased stop position and an operated proceed position; a governing circuit for said signal; a device adapted to be governed electrically; circuits for rendering said device effective, yone oi. said circuits being closed temporarily while said signal is assuming its biased stop position and while a track circuit section adjacent to said signal is occupied, the other of said circuits being effective to maintain said device effective only when said device itself is effective at the time this other circuit is closed; means .for closing the other of said circuits subsequent to the occupation of said adjacent track circuit section but prior to the interruption of said first circuit; said means also maintaining said second circuit closed so long as said signal remains in its biased position; and another signal controlled byv said device.

48. In a signaling system for railways, in combination: a track circuit section; a circuit controller governed by said track circuit section and open when that track circuit section is occupied; another circuit controlmaining closed .temporarily subsequent toy the occupation of said track circuit section; a device adapted to be governed electrically; a circuit for rendering said device effective and including said device and said first circuit controller; means for closing said circuit before said first -circuit controller is opened by the presence of a train on said track circuit section; another circuit for maintaining said device effective which is controlled by said second circuit controller and which is initially eective only if the device itself is effective at the time this other circuit is closed; and means for signaling governed by said device.

49. In a signaling system for railways, in combination: a stretch of trackway divided into track circuit sections; a signal for governing trafiic over said stretch; a circuit controller responsive to the presence of a train on a track circuit section protected by said signal and remaining temporarily closed subsequent to the occupation of said vsection by a train; a device adapted to be controlled electrically; means for signaling controlled by said device; an energizing circuit for said device governed jointly by said 'circuit controller and a track circuit section adjacent to said signal; and a maintaining circuitv for said device controlled by said track circuit section protected by said signal, said maintaining circuit being initially effective only if the device itself is eective at the time said maintaining circuit is closed. 50. In a signaling system for railways, in combination: a stretch of trackway divided into track circuit sections; 'ar circuit,y controller having an open position and a closed position and remaining temporarily closed after a change in its governing circuit; a governing circuit for said circuit controller; a signal; and means for governing said signal, said means beingcontrolled jointly by said circuit controller and a track circuit section of said stretch of trackway, and being also controlled by said governing circuit alone after said means has responded lto the controlling influence of said circuit controller and said track circuit section.

51. In a signaling system for railways, in combination: a stretch of trackway divided into track circuit sections;-a first semaphore and a second semaphore, each having a proceed aspect and a stop aspect; a controlling y circuit for the first semaphore; means for governing the second semaphore, said mea-ns being controlled jointly by said controlling circuit for said first semaphore and a trac circuit sectionadjacent to said first semaphore. and being rendered efective when' said -rst semaphore indicates proceed, and

-semaphore which is rendered e first mentioned means effective so long as the first semaphore indicates stop, said lastl mentioned means being initially effective only when said first mentioned means is effective. l

52. In a. signaling system for railways, in combination: a stretch of trackway divided into track circuit sections; a semaphore for governing traffic in one direction over said stretch and having a proceed aspectjand a stop aspect; a circuit controller subjected to the same controlling influence as said semaphore and closed when said semaphore indicates proceed; another circuit controller governed by a track circuit section adjacent to said semaphore and closed when that track circuit section is occupied; a, circuit including in series both of said circuit controllers; a second semaphore for governing traffic in the same direction as said first semaphore; means for governin said second ective When said circuit is closed; and means controlled by a track circuited portion of the trackvvay protected by said first semaphore for maintaining said first mentioned means effective so long as this portion of the trackway is occupied by a train, said last mentioned means being initially effective only when said first mentioned means is effective.

53. In a signaling system 'for railways, in combination: a stretch of trackway di- '.vided into track circuit sections; a semaphore for governing traffic in one direction over said stretch; a governing circuit for said semaphore; a second semaphore having a predetermined aspect when the track circuit sections protected'by said first semaphore are occupied; means for modifying said'predtermined aspect ofsaid second semaphore, said means being controlled jointly by said governing circuit for said first semaphore and a track circuit section adjacent to said first semaphore; and means for maintaining said first mentioned means effective so long as the first semaphore indicates stop, said last mentioned means being initially dependent upon said first mentioned means being concurrently effective.

. 54. In a signaling system for railways, in combination: a stretch `of trackway divided into track circuit sections; a semaphore for governing traffic in one direction over said stretch; a governing circuit for said semaphore; a second semaphore having a predetermined aspect when the portion of the trackway protected by said first semaphore is occupied; means for modifying said predetermined aspect of said second semaphore; an energizing circuit for said means controlled jointly by said governing circuit for said first semaphore and a track circuit section adjacent to said for maintaining the' first semaphore; and a.

maintaining *circuit for said means lcontrolled by said governing circuit of said first semaphore and initially effective only when said energizing circuit is concurrently estab- In a signaling system for railways, in combination: two adjacent track circuit sections; a circuit controller overned by' one of said track circuit sections and closed when that section is occupied; another circuit controller governed by the other track )circuit section and open when that section is occupied; a device adapted to be governed electrically; a circuitl including in series said device and both of said circuit controllers, said device being rendered effective when said circuit is closed; means controlled by said second mentioned track circuit section for maintaining said device in its effective condition; -said last mentioned vmeans being initially effective only when said device is concurrently effective; and

56. In a signaling system.' for railways,

in combination: a stretch of trackvvay divlded into* track circuitsections; a signal;

a circuit controller subjected to the same l l controlling infiuencefas said signal and closed when said signal indicates proceed, another circuit controller governed by a track circuit section of said trackway, said another circuit controller being closed vvhenV said track circuit section is occupied; a device adapted to bc governed electrically; a circuit for rendering said device effective When closed and including in series both of said circuit controllers; means subjected to the same controlling influence as said signal for maintaining said device effective'after it has been rendered effective by the closing of said circuit; and. means for signaling governed by said device.

57. In a signaling system for railways in combination: a stretch of traclnvay di vided into track circuit sections; asignal: a circuit controller subjected to the same controlling influence as said signal and closed when said signal indicates proceed: another circuit controller governed by a track circuit section of the trackway; said another circuit controller being closed when said track circuit section is occupied; a device adapted to be governed electrically; a circuit for rendering said devicev effective when closed and including in series both of said circuit controllers; another circuit for maintaining said device effective which is normally open and which is ineffective unless said device is effective; means governed by the track section adjacent to and protected by said signal for establishing said last mentioned circuit before said first circuit is interrupted; and means for signaling governed by said device.

58. In a signaling system for railways,

- in combination: two track circuit sections; pied; a circuit including in series both of 10 a signal for governing traiic` in Aone direcsaid circuit controllers; and Ineans for sigtion over said track circuit sectlons; a cirnaling governed by said circult. cuit controller governed by a track circuit WILMER W SALMON section adjacent to said signal and closed when that track circuit section is occupied; FRANK L D-ODGSON' another circuit controller governed by both Witnesses: of vsaid track clrciut sections and open when LILLIAN L. PHILLIPS, elther of sald track circuitl sectlons 1s occu- GEORGE T. WHITNEY. 

